Weather in Purchase Line, PA
Purchase Line, Sunday, 9 August, 05:42
Partly cloudy. Feels like 67°. High 83°, low 66°.
Monthly outlook for Purchase Line, PA: average high 80.1°, average low 59.2°. That is 1.7° above the climate normal for August. Precipitation is expected on 5 days (about 1.8 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 21 August (91°), the coolest 15 August (47.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 75.7° | 77.6° | -1.1° |
| 19 August – 28 August | 87.3° | 76.6° | +6° |
| 29 August – 7 September | at normal | 75.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Westover (13 mi).
0.39
Purchase Line, Monday, 10 August
Heavy rain. High 81°, low 64°.
1.13Purchase Line, Tuesday, 11 August
Heavy rain. High 82°, low 63°.
0.02Purchase Line, Wednesday, 12 August
Light rain. High 78°, low 63°.
0.06Purchase Line, Thursday, 13 August
Light rain. High 73°, low 56°.
0
Purchase Line, Friday, 14 August
Partly cloudy. High 70°, low 49°.
0Purchase Line, Saturday, 15 August
Partly cloudy. High 70°, low 48°.
0
Purchase Line, Sunday, 16 August
Overcast. High 68°, low 49°.
0Purchase Line, Monday, 17 August
Partly cloudy. High 74°, low 51°.
0
Purchase Line, Tuesday, 18 August
Clear. High 77°, low 54°.
0
Purchase Line, Wednesday, 19 August
Mostly clear. High 80°, low 56°.
0Purchase Line, Thursday, 20 August
Mostly clear. High 86°, low 61°.
0.06Purchase Line, Friday, 21 August
Light rain. High 91°, low 67°.
0Purchase Line, Saturday, 22 August
Clear. High 86°, low 65°.
0Purchase Line, Sunday, 23 August
Mostly clear. High 90°, low 65°.
0.17Purchase Line, Monday, 24 August
Light rain. High 91°, low 70°.
0.05Purchase Line, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.06Purchase Line, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.12
Purchase Line, Thursday, 27 August
Climate normal for this date — 60-year average.
0.16Purchase Line, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Purchase Line, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11Purchase Line, Sunday, 30 August
Climate normal for this date — 60-year average.
0.14Purchase Line, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Purchase Line, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.12Purchase Line, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.1Purchase Line, Thursday, 3 September
Climate normal for this date — 60-year average.
0.11Purchase Line, Friday, 4 September
Climate normal for this date — 60-year average.
0.09Purchase Line, Saturday, 5 September
Climate normal for this date — 60-year average.
0.17Purchase Line, Sunday, 6 September
Climate normal for this date — 60-year average.
0.14Purchase Line, Monday, 7 September
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Purchase Line, PA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Purchase Line, PA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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